26B AP Tax Calculation not working as expected

Summary:

Since 26B AP Tax Calculation not working as expected for UK and SE (markets I've tested for)

Content (please ensure you mask any confidential information):

have tried multiple suppliers across those 2 markets.

Tax applicability flag is checked and tax classification code is populated at supplier address level. nothing changed otherwise on instance apart from 26B

Still working in Prod as expected

we get 26B to prod this weekend

have logged an SR

anyone else experienced the same?

now going to test on another 26B updated non-prod instance

Version (include the version you are using, if applicable):

26B

Code Snippet (add any code snippets that support your topic, if applicable):